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Flora of New Zealand Ferns and Lycophytes

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Flora of New Zealand Ferns and Lycophytes FLORA OF NEW ZEALAND FERNS AND LYCOPHYTES EQUISETACEAE P.J. BROWNSEY & L.R. PERRIE Fascicle 6 – MARCH 2015 © Landcare Research New Zealand Limited 2015. Unless indicated otherwise for specific items, this copyright work is licensed under the Creative Commons Attribution 3.0 New Zealand license. Attribution if redistributing to the public without adaptation: “Source: Landcare Research" Attribution if making an adaptation or derivative work: “Sourced from Landcare Research" See Image Information for copyright and licence details for images. CATALOGUING IN PUBLICATION Brownsey, P.J. (Patrick John), 1948- Flora of New Zealand [electronic resource] : ferns and lycophytes. Fascicle 6, Equisetaceae / P.J. Brownsey and L.R. Perrie. -- Lincoln, N.Z. : Manaaki Whenua Press, 2015. 1 online resource ISBN 978-0-478-34775-3 (pdf) ISBN 978-0-478-34761-6 (set) 1.Ferns -- New Zealand - Identification. I. Perrie, L.R. (Leon Richard). II. Title. III. Manaaki Whenua- Landcare Research New Zealand Ltd. UDC 582.374.2(931)DC 587.20993 DOI: 10.7931/B1159G This work should be cited as: Brownsey, P.J. & Perrie, L.R. 2015: Equisetaceae. In: Breitwieser, I.; Heenan, P.B.; Wilton, A.D. Flora of New Zealand — Ferns and Lycophytes. Fascicle 6. Manaaki Whenua Press, Lincoln. http://dx.doi.org/10.7931/B1159G Cover image: Equisetum arvense, sterile stems with lateral branches arising in whorls at nodes. Contents Introduction..............................................................................................................................................1 Taxa Equisetaceae Michx. ex DC. ............................................................................................................. 2 Equisetum L. ......................................................................................................................................2 Equisetum arvense L. ........................................................................................................................3 Equisetum fluviatile L. ........................................................................................................................5 Equisetum hyemale L. ....................................................................................................................... 6 References ............................................................................................................................................. 8 Acknowledgements .................................................................................................................................9 Maps .....................................................................................................................................................10 Index .....................................................................................................................................................12 Image Information .................................................................................................................................13 Introduction The family Equisetaceae is represented in New Zealand by one genus with three introduced species; all are classified as Unwanted Organisms. Equisetum arvense was first recorded in Wanganui in 1922 and has since spread aggressively along river banks throughout much of the southern North Island, and northern South Island. Equisetum hyemale is less invasive, occurring in mostly urban areas from Whangarei to Invercargill, whilst E. fluviatile is known from just one collection near Huntly. All species of Equisetum have a characteristic growth form with erect aerial stems that are usually hollow, jointed and longitudinally grooved, produce whorls of branches and leaves, and bear conspicuous terminal strobili which themselves comprise whorls of peltate sporangiophores. Species of Equisetum are commonly known as horsetails because of their distinctive appearance, or as scouring rushes because of their high silica content. 1 Equisetaceae Michx. ex DC., Essai Propr. Méd. Pl., 49 (1804) Type taxon: Equisetum L. Terrestrial ferns. Underground stems long-creeping, freely branching, bearing wiry roots. Aerial stems green, erect, branching in whorls or unbranched, usually with a central hollow surrounded by two rings of smaller alternating cavities, jointed, longitudinally grooved, siliceous, glabrous, bearing leaves in sheathing whorls at the nodes. Leaves united laterally into a sheath, toothed at the apices, equalling the number of stem grooves. Veins undivided in each leaf. Strobili terminal on main aerial stems, or sometimes on lateral stems, or on specialised shoots lacking chlorophyll, bearing stalked peltate sporangiophores arranged in whorls. Several sporangia pendent from adaxial surface of heads of sporangiophores; each sporangium sessile, lacking an annulus and dehiscing by a longitudinal slit, containing 1000s of spores and elaters. Homosporous; spores alete, spherical, attached to four coiled elaters, granulate to smooth, chlorophyllous. Taxonomy: A family of one genus and 15 species (Hauke 1990). The Equisetaceae is a very distinctive family of terrestrial ferns with erect aerial stems that are usually hollow, jointed and longitudinally grooved, produce whorls of branches and leaves, bear conspicuous terminal strobili comprising whorls of peltate sporangiophores, and have a base chromosome number of 108. Traditionally the Equisetaceae has been included within the fern allies, and is clearly related to early groups of fossil plants in the Sphenophyllales and Calamitales. However, molecular evidence now indicates that the family is part of the ferns, albeit distantly related and its exact placement remains uncertain. Pryer et al. (2004) and Smith et al. (2006) treated Equisetaceae as sister to Marattiaceae, but Rai & Graham (2010) suggested that the group is sister to the rest of the ferns. Christenhusz et al. (2011) considered the latter position to be more consistent with the fossil record but continued to include Equisetaceae within the ferns. Distribution: Virtually cosmopolitan except for Australia and New Zealand. Three naturalised species occur in New Zealand. Biostatus: Exotic; fully naturalised. Table 1: Number of species in New Zealand within Equisetaceae Michx. ex DC. Category Number Exotic: Fully Naturalised 2 Exotic: Casual 1 Total 3 Equisetum L., Sp. Pl., 1061 (1753) Type taxon: Equisetum arvense L. Etymology: From the Latin equus (horse), and seta (bristle), a reference to the resemblance of the vegetative stem to a horse's tail. Vernacular names: horsetail; scouring rush Terrestrial ferns. Underground stems long-creeping, freely branching, bearing wiry roots. Aerial stems green, erect, branching in whorls or unbranched, usually with a central hollow surrounded by two rings of smaller alternating cavities, jointed, longitudinally grooved, siliceous, glabrous, bearing leaves in sheathing whorls at the nodes. Leaves united laterally into a sheath, toothed at the apices, equalling the number of stem grooves. Veins undivided in each leaf. Strobili terminal on main aerial stems, or sometimes on lateral stems, or on specialised shoots lacking chlorophyll, bearing stalked peltate sporangiophores arranged in whorls. Several sporangia pendent from adaxial surface of heads of sporangiophores; each sporangium sessile, lacking an annulus and dehiscing by a longitudinal slit, containing 1000s of spores and elaters. Homosporous; spores alete, spherical, attached to four coiled elaters, granulate to smooth, chlorophyllous. Taxonomy: A genus of 15 species. Equisetum comprises two well-marked subgenera, Equisetum and Hippochaete (Hauke 1990). Subgenus Equisetum is distinguished by its superficial stomata, which are usually scattered or in bands of two or more stomata wide, by its non-apiculate strobili, and its annual, regularly branched, aerial stems. Subgenus Hippochaete has sunken stomata in single lines, apiculate strobili, and usually perennial, often unbranched, aerial stems. Of the species occurring in New Zealand, E. hyemale belongs to subgenus Hippochaete, and E. arvense and E. fluviatile to subgenus Equisetum. 2 1 Fertile and sterile stems dimorphic; sterile stems with abundant whorls of branches .......................................................... .......................................................... arvense Fertile and sterile stems monomorphic; sterile stems unbranched, or only sparsely branched .................................................................................................................. 2 2 Sterile stems 400–600 mm tall, sparsely branched; ridges on aerial stems smooth; apices of strobili obtuse ................................................................................ fluviatile Sterile stems 1000–2000 mm tall, usually unbranched; ridges on aerial stems with two rows of tubercles; apices of strobili apiculate .................................... hyemale Distribution: Virtually cosmopolitan except for Australia and New Zealand. Two species fully naturalised, and one casual, in New Zealand. Biostatus: Exotic; fully naturalised. Table 2: Number of species in New Zealand within Equisetum L. Category Number Exotic: Fully Naturalised 2 Exotic: Casual 1 Total 3 Cytology: n = 108 (Hauke 1990). Notes: Equisetum was possibly first introduced to New Zealand in 1900 by Leonard Cockayne who obtained four species from Karl Goebel in Munich and grew them in his garden at New Brighton. He quickly regretted his choice of plants and shortly after had to eradicate them before they became
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